Solar System Planets | Mercury is the closest planet to the Sun and the smallest. It is a rocky planet like Venus, Earth, and Mars. It is named after the Roman god of commerce due to its speed. After Earth, Mercury is the second densest planet.
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MERCURY Mercury is the closest planet to the Sun and the smallest. It is a rocky planet like Venus, Earth, and Mars. It is named after the Roman god of commerce due to its speed. After Earth, Mercury is the second densest planet.